Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service San Juan PR
455 AM AST Sun Aug 31 2025
PRZ001>005-007-008-010>013-VIZ001-002-312100-
/O.NEW.TJSJ.XH.W.0009.250831T1400Z-250831T2100Z/
San Juan and Vicinity-Northeast-Southeast-Eastern Interior-North
Central-Ponce and Vicinity-Northwest-Mayaguez and Vicinity-
Southwest-Culebra-Vieques-St.Thomas...St. John...and Adjacent
Islands-St Croix-
Including the cities of Isabela, Hormigueros, Lajas, San German,
Humacao, Barceloneta, Comerio, Anna`s Retreat, Aguadilla,
Naguabo, Ponce, Maunabo, Florida, Vega Baja, Hatillo, Guayama,
Guaynabo, Salinas, Toa Baja, Charlotte Amalie, Charlotte Amalie
West, Vega Alta, Grove Place, Guayanilla, Aguada, Las Piedras,
San Juan, Catano, Vieques, Arroyo, Carolina, Santa Isabel,
Patillas, Loiza, Aguas Buenas, Mayaguez, Toa Alta, Rio Grande,
Juana Diaz, Frederiksted, Frederiksted Southeast, Caguas,
Penuelas, Yabucoa, Cayey, Gurabo, Manati, Quebradillas, Rincon,
Trujillo Alto, Cruz Bay, Christiansted, Dorado, Anasco, Fajardo,
San Lorenzo, Juncos, Yauco, Camuy, Cidra, Cabo Rojo, Culebra,
Arecibo, Bayamon, Moca, Charlotte Amalie East, Canovanas,
Luquillo, Ceiba, and Guanica
455 AM AST Sun Aug 31 2025
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM THIS MORNING TO 5 PM
AST THIS AFTERNOON...
* WHAT...This level of heat affects anyone without effective cooling
and/or adequate hydration. Impacts likely in some health systems,
heat-sensitive industries and infrastructure.
* WHERE...All coastal and urban areas of Puerto Rico, as well as the
valleys of the eastern interior. St. Thomas, St. John, St. Croix,
Vieques and Culebra.
* WHEN...From 10 AM this morning to 5 PM AST this afternoon.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Stay cool, stay hydrated, stay informed.
Monitor the latest forecasts and warnings for updates.
&&
$$
MRR
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service San Juan PR
519 AM AST Sun Aug 31 2025
AMZ711>745-PRZ001>013-010930-
San Juan and Vicinity-Northeast-Southeast-Eastern Interior-
North Central-Central Interior-Ponce and Vicinity-Northwest-
Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques-
The nearshore and off shore Atlantic and Caribbean Coastal Waters-
519 AM AST Sun Aug 31 2025
This Hazardous Weather Outlook is for portions of Puerto Rico.
.DAY ONE...Today and Tonight
.Lightning...Isolated thunderstorms, particularly across
the interior and western sections of PR. Stay alert and be
prepared to take shelter if storms develop.
.Excessive Rainfall...Flooding in urban areas, roads, small
streams, and washes, particularly across the interior and western
sections of PR. There is a low chance of isolated flash floods.
Elsewhere, plan for water ponding on roads and in poorly drained
areas as rainfall activity could strong and very wide spread.
.Excessive Heat...This level of heat affects anyone without
effective cooling and/or adequate hydration, with those sensitive
to heat at the highest risk. Impacts likely in some health
systems, heat-sensitive industries and infrastructures. These
conditions are most likely across all low, urban and coastal areas
of Puerto Rico.
.DAYS TWO THROUGH SEVEN...Monday through Saturday
Heat threats will remain the primary concern through Monday while
the risk of flooding and lightning strikes will persist each day
(particularly during the afternoons). During the weekend we
expect the arrival of a tropical wave, which will increase the
potential for rainfall activity and instability across the islands.
Low marine and coastal risks are forecast through Thursday.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is encouraged. Please relay any information
about flooding, winds, waves, and rip currents to the National
Weather Service in San Juan.
$$
Hazardous Weather Outlook
National Weather Service San Juan PR
519 AM AST Sun Aug 31 2025
AMZ716-726-VIZ001-002-010930-
St. Thomas St. John adjacent Islands-St Croix-
Nearshore Atlantic and adjacent Caribbean Coastal Waters-
519 AM AST Sun Aug 31 2025
This Hazardous Weather Outlook is for portions of USVI.
.DAY ONE...Today and Tonight
.Excessive Heat...This level of heat affects anyone without
effective cooling and/or adequate hydration, with those sensitive
to heat at the highest risk. Impacts likely in some health
systems, heat-sensitive industries and infrastructures. These
conditions are most likely across low, urban and coastal areas
of Saint Thomas, Saint John, and Saint Croix.
.DAYS TWO THROUGH SEVEN...Monday through Saturday
Heat threats will remain the primary concern through Monday while
the risk of flooding and lightning strikes will persist each day
(particularly during the afternoons). During the weekend we
expect the arrival of a tropical wave, which will increase the
potential for rainfall activity and instability across the islands.
Low marine and coastal risks are forecast through Thursday.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is encouraged. Please relay any information
about flooding, winds, waves, and rip currents to the National
Weather Service in San Juan.
$$
